Root/
1 | #include <linux/skbuff.h> |
2 | #include <linux/netdevice.h> |
3 | #include <linux/if_vlan.h> |
4 | #include <linux/netpoll.h> |
5 | #include <linux/export.h> |
6 | #include "vlan.h" |
7 | |
8 | bool vlan_do_receive(struct sk_buff **skbp) |
9 | { |
10 | struct sk_buff *skb = *skbp; |
11 | u16 vlan_id = skb->vlan_tci & VLAN_VID_MASK; |
12 | struct net_device *vlan_dev; |
13 | struct vlan_pcpu_stats *rx_stats; |
14 | |
15 | vlan_dev = vlan_find_dev(skb->dev, vlan_id); |
16 | if (!vlan_dev) |
17 | return false; |
18 | |
19 | skb = *skbp = skb_share_check(skb, GFP_ATOMIC); |
20 | if (unlikely(!skb)) |
21 | return false; |
22 | |
23 | skb->dev = vlan_dev; |
24 | if (skb->pkt_type == PACKET_OTHERHOST) { |
25 | /* Our lower layer thinks this is not local, let's make sure. |
26 | * This allows the VLAN to have a different MAC than the |
27 | * underlying device, and still route correctly. */ |
28 | if (ether_addr_equal(eth_hdr(skb)->h_dest, vlan_dev->dev_addr)) |
29 | skb->pkt_type = PACKET_HOST; |
30 | } |
31 | |
32 | if (!(vlan_dev_priv(vlan_dev)->flags & VLAN_FLAG_REORDER_HDR)) { |
33 | unsigned int offset = skb->data - skb_mac_header(skb); |
34 | |
35 | /* |
36 | * vlan_insert_tag expect skb->data pointing to mac header. |
37 | * So change skb->data before calling it and change back to |
38 | * original position later |
39 | */ |
40 | skb_push(skb, offset); |
41 | skb = *skbp = vlan_insert_tag(skb, skb->vlan_tci); |
42 | if (!skb) |
43 | return false; |
44 | skb_pull(skb, offset + VLAN_HLEN); |
45 | skb_reset_mac_len(skb); |
46 | } |
47 | |
48 | skb->priority = vlan_get_ingress_priority(vlan_dev, skb->vlan_tci); |
49 | skb->vlan_tci = 0; |
50 | |
51 | rx_stats = this_cpu_ptr(vlan_dev_priv(vlan_dev)->vlan_pcpu_stats); |
52 | |
53 | u64_stats_update_begin(&rx_stats->syncp); |
54 | rx_stats->rx_packets++; |
55 | rx_stats->rx_bytes += skb->len; |
56 | if (skb->pkt_type == PACKET_MULTICAST) |
57 | rx_stats->rx_multicast++; |
58 | u64_stats_update_end(&rx_stats->syncp); |
59 | |
60 | return true; |
61 | } |
62 | |
63 | /* Must be invoked with rcu_read_lock. */ |
64 | struct net_device *__vlan_find_dev_deep(struct net_device *dev, |
65 | u16 vlan_id) |
66 | { |
67 | struct vlan_info *vlan_info = rcu_dereference(dev->vlan_info); |
68 | |
69 | if (vlan_info) { |
70 | return vlan_group_get_device(&vlan_info->grp, vlan_id); |
71 | } else { |
72 | /* |
73 | * Lower devices of master uppers (bonding, team) do not have |
74 | * grp assigned to themselves. Grp is assigned to upper device |
75 | * instead. |
76 | */ |
77 | struct net_device *upper_dev; |
78 | |
79 | upper_dev = netdev_master_upper_dev_get_rcu(dev); |
80 | if (upper_dev) |
81 | return __vlan_find_dev_deep(upper_dev, vlan_id); |
82 | } |
83 | |
84 | return NULL; |
85 | } |
86 | EXPORT_SYMBOL(__vlan_find_dev_deep); |
87 | |
88 | struct net_device *vlan_dev_real_dev(const struct net_device *dev) |
89 | { |
90 | return vlan_dev_priv(dev)->real_dev; |
91 | } |
92 | EXPORT_SYMBOL(vlan_dev_real_dev); |
93 | |
94 | u16 vlan_dev_vlan_id(const struct net_device *dev) |
95 | { |
96 | return vlan_dev_priv(dev)->vlan_id; |
97 | } |
98 | EXPORT_SYMBOL(vlan_dev_vlan_id); |
99 | |
100 | static struct sk_buff *vlan_reorder_header(struct sk_buff *skb) |
101 | { |
102 | if (skb_cow(skb, skb_headroom(skb)) < 0) |
103 | return NULL; |
104 | memmove(skb->data - ETH_HLEN, skb->data - VLAN_ETH_HLEN, 2 * ETH_ALEN); |
105 | skb->mac_header += VLAN_HLEN; |
106 | return skb; |
107 | } |
108 | |
109 | struct sk_buff *vlan_untag(struct sk_buff *skb) |
110 | { |
111 | struct vlan_hdr *vhdr; |
112 | u16 vlan_tci; |
113 | |
114 | if (unlikely(vlan_tx_tag_present(skb))) { |
115 | /* vlan_tci is already set-up so leave this for another time */ |
116 | return skb; |
117 | } |
118 | |
119 | skb = skb_share_check(skb, GFP_ATOMIC); |
120 | if (unlikely(!skb)) |
121 | goto err_free; |
122 | |
123 | if (unlikely(!pskb_may_pull(skb, VLAN_HLEN))) |
124 | goto err_free; |
125 | |
126 | vhdr = (struct vlan_hdr *) skb->data; |
127 | vlan_tci = ntohs(vhdr->h_vlan_TCI); |
128 | __vlan_hwaccel_put_tag(skb, vlan_tci); |
129 | |
130 | skb_pull_rcsum(skb, VLAN_HLEN); |
131 | vlan_set_encap_proto(skb, vhdr); |
132 | |
133 | skb = vlan_reorder_header(skb); |
134 | if (unlikely(!skb)) |
135 | goto err_free; |
136 | |
137 | skb_reset_network_header(skb); |
138 | skb_reset_transport_header(skb); |
139 | skb_reset_mac_len(skb); |
140 | |
141 | return skb; |
142 | |
143 | err_free: |
144 | kfree_skb(skb); |
145 | return NULL; |
146 | } |
147 | EXPORT_SYMBOL(vlan_untag); |
148 | |
149 | |
150 | /* |
151 | * vlan info and vid list |
152 | */ |
153 | |
154 | static void vlan_group_free(struct vlan_group *grp) |
155 | { |
156 | int i; |
157 | |
158 | for (i = 0; i < VLAN_GROUP_ARRAY_SPLIT_PARTS; i++) |
159 | kfree(grp->vlan_devices_arrays[i]); |
160 | } |
161 | |
162 | static void vlan_info_free(struct vlan_info *vlan_info) |
163 | { |
164 | vlan_group_free(&vlan_info->grp); |
165 | kfree(vlan_info); |
166 | } |
167 | |
168 | static void vlan_info_rcu_free(struct rcu_head *rcu) |
169 | { |
170 | vlan_info_free(container_of(rcu, struct vlan_info, rcu)); |
171 | } |
172 | |
173 | static struct vlan_info *vlan_info_alloc(struct net_device *dev) |
174 | { |
175 | struct vlan_info *vlan_info; |
176 | |
177 | vlan_info = kzalloc(sizeof(struct vlan_info), GFP_KERNEL); |
178 | if (!vlan_info) |
179 | return NULL; |
180 | |
181 | vlan_info->real_dev = dev; |
182 | INIT_LIST_HEAD(&vlan_info->vid_list); |
183 | return vlan_info; |
184 | } |
185 | |
186 | struct vlan_vid_info { |
187 | struct list_head list; |
188 | unsigned short vid; |
189 | int refcount; |
190 | }; |
191 | |
192 | static struct vlan_vid_info *vlan_vid_info_get(struct vlan_info *vlan_info, |
193 | unsigned short vid) |
194 | { |
195 | struct vlan_vid_info *vid_info; |
196 | |
197 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) { |
198 | if (vid_info->vid == vid) |
199 | return vid_info; |
200 | } |
201 | return NULL; |
202 | } |
203 | |
204 | static struct vlan_vid_info *vlan_vid_info_alloc(unsigned short vid) |
205 | { |
206 | struct vlan_vid_info *vid_info; |
207 | |
208 | vid_info = kzalloc(sizeof(struct vlan_vid_info), GFP_KERNEL); |
209 | if (!vid_info) |
210 | return NULL; |
211 | vid_info->vid = vid; |
212 | |
213 | return vid_info; |
214 | } |
215 | |
216 | static int __vlan_vid_add(struct vlan_info *vlan_info, unsigned short vid, |
217 | struct vlan_vid_info **pvid_info) |
218 | { |
219 | struct net_device *dev = vlan_info->real_dev; |
220 | const struct net_device_ops *ops = dev->netdev_ops; |
221 | struct vlan_vid_info *vid_info; |
222 | int err; |
223 | |
224 | vid_info = vlan_vid_info_alloc(vid); |
225 | if (!vid_info) |
226 | return -ENOMEM; |
227 | |
228 | if (dev->features & NETIF_F_HW_VLAN_FILTER) { |
229 | err = ops->ndo_vlan_rx_add_vid(dev, vid); |
230 | if (err) { |
231 | kfree(vid_info); |
232 | return err; |
233 | } |
234 | } |
235 | list_add(&vid_info->list, &vlan_info->vid_list); |
236 | vlan_info->nr_vids++; |
237 | *pvid_info = vid_info; |
238 | return 0; |
239 | } |
240 | |
241 | int vlan_vid_add(struct net_device *dev, unsigned short vid) |
242 | { |
243 | struct vlan_info *vlan_info; |
244 | struct vlan_vid_info *vid_info; |
245 | bool vlan_info_created = false; |
246 | int err; |
247 | |
248 | ASSERT_RTNL(); |
249 | |
250 | vlan_info = rtnl_dereference(dev->vlan_info); |
251 | if (!vlan_info) { |
252 | vlan_info = vlan_info_alloc(dev); |
253 | if (!vlan_info) |
254 | return -ENOMEM; |
255 | vlan_info_created = true; |
256 | } |
257 | vid_info = vlan_vid_info_get(vlan_info, vid); |
258 | if (!vid_info) { |
259 | err = __vlan_vid_add(vlan_info, vid, &vid_info); |
260 | if (err) |
261 | goto out_free_vlan_info; |
262 | } |
263 | vid_info->refcount++; |
264 | |
265 | if (vlan_info_created) |
266 | rcu_assign_pointer(dev->vlan_info, vlan_info); |
267 | |
268 | return 0; |
269 | |
270 | out_free_vlan_info: |
271 | if (vlan_info_created) |
272 | kfree(vlan_info); |
273 | return err; |
274 | } |
275 | EXPORT_SYMBOL(vlan_vid_add); |
276 | |
277 | static void __vlan_vid_del(struct vlan_info *vlan_info, |
278 | struct vlan_vid_info *vid_info) |
279 | { |
280 | struct net_device *dev = vlan_info->real_dev; |
281 | const struct net_device_ops *ops = dev->netdev_ops; |
282 | unsigned short vid = vid_info->vid; |
283 | int err; |
284 | |
285 | if (dev->features & NETIF_F_HW_VLAN_FILTER) { |
286 | err = ops->ndo_vlan_rx_kill_vid(dev, vid); |
287 | if (err) { |
288 | pr_warn("failed to kill vid %d for device %s\n", |
289 | vid, dev->name); |
290 | } |
291 | } |
292 | list_del(&vid_info->list); |
293 | kfree(vid_info); |
294 | vlan_info->nr_vids--; |
295 | } |
296 | |
297 | void vlan_vid_del(struct net_device *dev, unsigned short vid) |
298 | { |
299 | struct vlan_info *vlan_info; |
300 | struct vlan_vid_info *vid_info; |
301 | |
302 | ASSERT_RTNL(); |
303 | |
304 | vlan_info = rtnl_dereference(dev->vlan_info); |
305 | if (!vlan_info) |
306 | return; |
307 | |
308 | vid_info = vlan_vid_info_get(vlan_info, vid); |
309 | if (!vid_info) |
310 | return; |
311 | vid_info->refcount--; |
312 | if (vid_info->refcount == 0) { |
313 | __vlan_vid_del(vlan_info, vid_info); |
314 | if (vlan_info->nr_vids == 0) { |
315 | RCU_INIT_POINTER(dev->vlan_info, NULL); |
316 | call_rcu(&vlan_info->rcu, vlan_info_rcu_free); |
317 | } |
318 | } |
319 | } |
320 | EXPORT_SYMBOL(vlan_vid_del); |
321 | |
322 | int vlan_vids_add_by_dev(struct net_device *dev, |
323 | const struct net_device *by_dev) |
324 | { |
325 | struct vlan_vid_info *vid_info; |
326 | struct vlan_info *vlan_info; |
327 | int err; |
328 | |
329 | ASSERT_RTNL(); |
330 | |
331 | vlan_info = rtnl_dereference(by_dev->vlan_info); |
332 | if (!vlan_info) |
333 | return 0; |
334 | |
335 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) { |
336 | err = vlan_vid_add(dev, vid_info->vid); |
337 | if (err) |
338 | goto unwind; |
339 | } |
340 | return 0; |
341 | |
342 | unwind: |
343 | list_for_each_entry_continue_reverse(vid_info, |
344 | &vlan_info->vid_list, |
345 | list) { |
346 | vlan_vid_del(dev, vid_info->vid); |
347 | } |
348 | |
349 | return err; |
350 | } |
351 | EXPORT_SYMBOL(vlan_vids_add_by_dev); |
352 | |
353 | void vlan_vids_del_by_dev(struct net_device *dev, |
354 | const struct net_device *by_dev) |
355 | { |
356 | struct vlan_vid_info *vid_info; |
357 | struct vlan_info *vlan_info; |
358 | |
359 | ASSERT_RTNL(); |
360 | |
361 | vlan_info = rtnl_dereference(by_dev->vlan_info); |
362 | if (!vlan_info) |
363 | return; |
364 | |
365 | list_for_each_entry(vid_info, &vlan_info->vid_list, list) |
366 | vlan_vid_del(dev, vid_info->vid); |
367 | } |
368 | EXPORT_SYMBOL(vlan_vids_del_by_dev); |
369 | |
370 | bool vlan_uses_dev(const struct net_device *dev) |
371 | { |
372 | struct vlan_info *vlan_info; |
373 | |
374 | ASSERT_RTNL(); |
375 | |
376 | vlan_info = rtnl_dereference(dev->vlan_info); |
377 | if (!vlan_info) |
378 | return false; |
379 | return vlan_info->grp.nr_vlan_devs ? true : false; |
380 | } |
381 | EXPORT_SYMBOL(vlan_uses_dev); |
382 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
jz-2.6.34-rc6
jz-2.6.34-rc7
jz-2.6.35
jz-2.6.36
jz-2.6.37
jz-2.6.38
jz-2.6.39
jz-3.0
jz-3.1
jz-3.11
jz-3.12
jz-3.13
jz-3.15
jz-3.16
jz-3.18-dt
jz-3.2
jz-3.3
jz-3.4
jz-3.5
jz-3.6
jz-3.6-rc2-pwm
jz-3.9
jz-3.9-clk
jz-3.9-rc8
jz47xx
jz47xx-2.6.38
master
Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9